Improvement in grindlng-mills



4Sheets--Sheet1. R. S. CATHCART.

Grinding-Mills.

Patented Feb. 17.1874.

INVENTEIH- a, s. GATHCABT.

Grinding-Mills.

Patented Feb. 17,1874.

No.l4i7,605.

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Patented Feb. 17,1874.

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R. S. CATHCART. Grinding-Mills. N0.147,605 I Patented Feb. I7. 1874.

nrrnn STATES PATENT OFFICE.

tODNEY S. CATHCART, OF CINCINNATI, OHIO, ASSIGNOR TO HIMSELF AND STRAUB MILL COMPANY, OF SAME PLACE.

lmeaovemenr m GRlNDlNG-MILLS.

Specification forming part of Letters Patent No. 14?,603, dated February 1?, 1874; application filed December 19, 1 :73.

To all whom it may concern:

Be it known that I, RODNEY S. CATHCART, of Cincinnati, in the county of Hamilton and in the State of Ohio, have invented certain new and useful Improvements in Grinding Mills; and I do hereby declare that the followin gis a full, clear, and exact description thereof, reference being had to the accompanying drawings making apart of this specification, in which- Figure lis aperspective view of my improved mill, a portion of the frame being broken away so as to show the operative mechanism. Fig. 2 is avertieal central section of the same upon line 00 x of Fig. 1. Fig. 3 is alike view of said mill upon a line having a right angle to that of Fig. 2. Fig. 4. is a horizontal section upon line y y of Fig. 2, and Fig. 5 is a like view upon line 2 z of same figure.

Letters of like name and kind refer to like parts in each of the figures.

The design of my invention is to increase the efficiency, ease of operation, and accuracy of adjustment of portable grinding-mills; and it consists, principally, in the peculiar construction of the mechanism employed for securing the horizontality of the upper fixed stone, substantially as and for the purpose hereinafter specified. It consists, further, in the means employed for inclosing the edges and lower side of the stones, substantially as and for the purpose hereinafter shown. It consists, further, in the means employed for securing the lower stone in position upon the spindle, substantially as and for the purpose hereinafter set forth. It consists, further, in the means employed for combining the countershaft and spindle, so as to preserve the relative positions of the engaging gear-wheel and pinion attached to the same, substantially as and for the purpose hereinafter shown and described.

In the annexed drawings, A and A represent four posts connected together at or near their lower ends by means of suitable cross-bars B and B, and at their upper ends by a metal spider, C, so as to form the usual supportingframe for the operating mechanism. Secured upon and extending between the longitudinal centers of two of the cross-bars B and B is a metal bar, D, which has, preferably, the form of an arch, is hollow and open at its lower side, and at its center is provided with a circular vertical opening, at, that receives and contains a correspondingly-shaped piece of metal, E, which is loosely fitted therein, so as to be capable of being easily moved longitudinally. At its lower end the piece E rests upon a boss, f, which extends upward from the longitudinal center of a lever, F, one end of which latter is pivoted within the hollow portion and near one end of bar D, while its opposite end is also contained within the hollow of said bar, and is loosely connected with one end of a bolt, G, that from thence extends upward through a hollow post, H, and is provided upon its upper threaded end with a nut, g, the arrangement of parts being such as to enable said piece E to be raised or lowered by the rotation of said nut 9 around its said bolt G. Within the upper end of the vertically-adjustable piece E is provided a recess, 0, that raises the step I of a spindle, K, which spindle from thence extends vertically upward, and has its upper end contained within a box, L, that is in turn contained within a corresponding opening in the spider C. The box L has, generally, a cylindrical shape, but at and immediately below its upper end is providedat equidistant points with four bosses or lugs, I, that extend radially outward and furnish bearings for the inner ends of four screws, M and M, which latter pass inward through threaded openings in the spider C and hold said box in position. By turning said screws toward or from the center, said box will be correspondingly moved so as to enable the spindle to be adjusted to vertical position. Motion is imparted to the spindle K by means of a bevel-pinion, N, which is secured near its lower end, and meshes with a bevel gear, 0, that is secured upon and revolves with a counter-shaft, P. The inner end of the shaft P has a bearing within the verticallyadjustable piece E, while its outer portion is journaled within a box, Q, that at its ends is pivoted upon or between two lugs, R and R, which are secured upon and extend upward from one of the cross-bars B, the arrangement of parts being such as to enable the inner end of said shaft to rise and fall with said piece E and the spindle K without changing therelativepositions of the engaging-teeth of the gear and pinion. Immediately above the pinion N the spindle K is reduced in size upon a regular taper, and upon or over such tapered portion is fitted a metal plate, S, which corresponds in size and form to, and furnishes a support for, the lower or running stone T. At its center and upper side said 'ilate is provided with a square hub, s, which extends upward within a similar but larger opening, it, formed within said stone, and has its sides formed upon upward and inward inclining lines. A key upon said plate, fitting into a corresponding key-way in said spindle, insures the relative radial positions of said parts. Having been placed in position upon the plate S, the horizontal adjustment of the stone T, with reference to the spindle K, is ett'ectcd by means of wedges 1, which are driven between the inclined sides of the hub 38 and the vertical sides of the opening 1,

after which the ren'iaining space within the latter is filled with lead or other soft molten metal, or by means of a plate, U, of suitable form and material. A metal band, V, shrunk around the edges of the stone and its supporting-plate, firmly clasps said parts together.

In order that the stone may be balanced, four cavities, x, are formed at equidistant points within the upper face, and wear the outer edge of the plate, and provided with suitable openings, through which molten metal may'bc poured. By partly or entirely iilling the cavity upon the lightest side of the stone, the balance will be restored in the usual manner. The lower side of theplate S, and the lower portion of the stone T, are inclosed by means of a metal casing, \V, which has the form shown in Figs. 1, 2, and 3, and extends between, and is secured upon, the posts A and A. The upper stone X, having the usual form, has secured upon its edge, near its upper side, a metal ring, A, which, at its lower edge, is provided with an outward-projecting flange, a, and, at equidistant points around its periphery, has four radial arms, B, as shown. Within each arm B is provided an opening, I), for the passage of a screw; and within the outer side of each opening is formed a rectangular recess, 1), that that corresponds to and receives a metal block, 0, the inner face of which latter is formed upon a circular link, and is provided with ascrewthread, said block thus forming a section of a nut. The arms B are each contained within a slotted standard, .1), which is secured upon, and extends vertically upward from, the easing W, midway between the posts A and A, said standards being arranged so as to insure the horizontal and circumferential positions of the stone X, while the vertical position of the latter is secured by means of a screw, E, that is journaled at its ends within' each standard, and passes through the opening in the arm contained therein. A set screw, a, passing longitudinally i11- ward through the end of each arm, bears against the sectional nut C, and enables the latter to be pressed inward, so as to cause it to engage with the screw E, by which means the rotation-of said screw will cause said nut, the arm, and the corresponding side of the upper stone, to be raised or lowered. A hand-wheel, 1 attached to the upper end of each screw, enables the same to be manipulated, and the horizontal adjustment of the stone to be easily and quickly secured. The space between the supporting-ring A and the casing \V is inclosed by means of a metal hoop, G, which is fitted closely within the latter, and at its upper edge bears against the lower edge of the former. The vertical dimensions of said hoop are such as to permit it to be pressed downward within said casing whenever it is necessary that the edges of the stones should be uncovcred.

The usual appliances are provided for feeding grain to the stones, while the product of the same escapes through a spout or chute, 10, that is attached to, and extends downward and outward from, one side of the easing \V.

The machine, thus constructed, is exceed ingly simple and compact, is ci'ticiei'it'in operation, and can be adjusted with great ease and nicety.

Having thus fully set forth the nature and merits of my invention, what I claim as new is- 1. The means employed for securing the horizontality of the upper or stationary stone, consisting of the screws E, working vertically within suitable bearings, and combined with the arms 15 by means of the sectional nuts 0 and setscrews a, substantially as and for' the purpose specified.

2. In combination with the stones T and X, the casing \V, flanged band A, and vertically-adjustable hoop G, constructed and arranged to operate substantially as and for the purpose shown.

3. In combination with the spindle K and running-stone T, the metal plate S, secured upon said spindle, provided with the square hub s, and connected to or with said stone by means of the wedges t and the metal band V, substantially as and for the purpose set forth.

4:. The means employed for preserving the relative positions of the lower end of the spindle K, and the inner end of the shaft 1, consisting of the combined and verticallyadjustable step and journal box IE, and the pivoted box Q, said parts being constructed as shown, and combined with said spindle and shaft in the manner substantially as specified.

In testimony that I claim the foregoing I have hereunto set my hand this 12th day of December, L373.

RODNEY S. OATHOART.

\Yi tnesses:

.T. (l. SPARKS, A. M. IIALLEY. 

